Specifications

AMC-101 Alarm Relay 4-1
Chapter 4
Alarms and Diagnostics
4.1 Alarm Relay
The rear panel of AMC-101 units includes a D-type 9-pin female connector
designated ALARMS. Figure 4-1 illustrates the pinout of the AMC-101 alarm relay
connector.
1
6
2
7
3
8
4
9
5
Figure 4-1. Alarm Relay Connector Pinout
The ALARMS connector is used to relay the following alarms:
• RED – Power Failure (DC voltage on board)
• YELLOW – Signal Detect Failure (to any of the unit modules)
• CONFIG – Improper Configuration (incompatible modules and/or data rates
selected).
Three pins are dedicated for each alarm: Common (COM), OK and FAIL. The
COM pin is the input for each alarm. The user can drive the COM pin with any
signal (0 to 5V). If the signal is received OK, the COM pin is connected to its
corresponding OK pin. If there is a failure, the COM pin is connected to its
corresponding FAIL pin. See Table 4-1 for the connector pin assignments.
For example, for the RED alarm the common input (COM) pin is 9. If there is no
power failure, it connects to pin 4 (OK). If there is a failure, pin 9 connects to pin 5
(FAIL).
Table 4-1. Alarm Relay Connector Pin Assignment
Alarm COM OK FAIL
RED 9 4 5
YELLOW 3 8 7
CONFIG 6 2 1
You can prevent AMC-101 from relaying CONFIG alarm by removing the JP2
jumper plug, as explained in Configuring AMC-101 in Chapter 2.
Note